MODIFIED DIVISION SPECIFICATIONS
F. REAR AXLE AND DRIVE
I. FUEL AND FUEL
K. WHEELS AND
L. ROLL CAGES AND
M. STEERING AND
a) Battery (one) must be securely mounted and shielded. Must be
located between the front
cross member of the frame and the rear axle.
b) All vehicles must have the capability of starting without being
pushed or pulled. Battery
disconnect switch must be located on deck on right hand side, and must
be able to be reached by
driver and safety crew easily.
c) Engine kill switch required within easy reach of driver. This
switch must be clearly
marked "off" and "on".
d) No radios or mirrors allowed.
e) No traction control devices of any type allowed.
a) 1970 or newer American passenger car only (no panel van or station
appearing front windshield supports (A pillars) and rear window support
units (B pillars)
(painted roll bars not acceptable substitute). May
utilize a half
windshield. All cars will be required to run full nose and lower
b) Firewall and floorboards are mandatory. All body parts should
recognizable as factory
production vehicle. Fiberglass or metal duplicates of body parts are
roofline shall be maintained and must be full size fiberglass roof (No
Handmade body parts may be constructed of steel, aluminum, or
fiberglass, but should be
recognizable as factory production vehicle. All cars must have complete
paint job. Nose section shall remain within 4" ground clearance rule. The
top of the interior must
be flush with the top of the door and quarter panels. Quarter panels and
B/C pillars must be
two distinct pieces. Sail panels can not be attached to spoiler. An
optional escape hatch right
side may be used, by bringing the metal from top of right door to
drivers compartment no higher
than 12" from the floor pan.
c) All numbers shall be in contrasting color from body, affixed to both
side doors and top, be
at least 4" thick and 20" high, and be readable from the
passenger side of car.
Letters added in conjunction with numbers, shall meet above criteria,
and be at least 5"
thick and 10" minimum height. A 6" number shall be placed on
nose and tail to help
line cars up!
d) Body must be same width, front to rear and parallel to frame.
e) No wings, vanes, spoilers or any other type of ground effects
allowed anywhere outside,
inside or under car. No vanes on noses, roofs, quarters, and doors.
Rear deck spoiler is
permitted a maximum of 4" (face) high. Supports for the spoiler may be
from the front or rear. A strengthening top bend that shall not
exceed 1/2" in width,
shall always face to the rear. A spoiler shall be no wider than the rear
of the body and be
66" maximum width and 53" minimum.
f) Engine compartment shall remain open, no side panels; sides may have
maximum 6" drop
and must be enclosed at rear of hood; maximum hood scoop height 6",
bodies shall extend no
father forward than rear of block. Rear of Bodies to be solid panel at
least 8" high and
90 degrees to the ground and flush with rear quarters. No panel in
front of right door to
engine compartment, and no inner panels.
g) Driver and passenger side windows must have at least 12" of
vertical opening to enhance
drivers exit from vehicle. Driver window safety net is mandatory.
Lexan or aluminum cowl
panel in front of driver can be no wider than cockpit and no farther
back than driver.
h) Three vertical safety bars constructed of 1/4" (minimum) steel
stock located not more
than 3" apart, shall be centered in windshield area in front of
driver, and welded to roll
i) BODY RAKE CLARIFICATION: From the front edge of the door, back to
the back edge of the
quarter panel, there will be a maximum of a 4" rake, while still being
within the minimum &
maximum dimensions. If you choose to run your doors level, from the
back edge of the door to
the back edge of the quarter panel will have a maximum rake of 2". All
interior panels will be
flush with the top of the door & quarter panels.
[A] 115" max, 108" min
[B] 38" max, 28" min
[C] 45" max, 34" min
[D] 120" max, 106" min
[E] 72" max
[F] 27" max, 22" min
[G] 54" max, 42" min
[H] 18" max, 12" min
[I] 66" max, 53" min
[J] 50" max, 44" min
[K] 56" max, 41" min
[L] 8" max, 6" min
[M] 4" min
[N] 20" max, 16" min
[O] 20" max, 16" min
[P] 6" min
[Q] 4" min "post-race"
[R] 19" max
[S] 36" max, 24" min
[T] 66" max, 24" min
[U] 4" max
[V] 6" max
[W] Interior slope is 4" max front to rear and flat across. If
you stay flat at front
half of interior you have used up 50% of your 4"!
[X] With level, rear of roof must not drop more than 2",
front of roof must not drop
more than 5".
[Y] 42" max
[Z] Hood sides 4" min, 6" max, 3" max rake.
NOTE: All height measurements from the ground are
a) All engines used in competition must be able to be used in
conventional passenger car
without alterations. No machine work on outside engine. No aluminum
engine blocks. Aluminum
b) No total or partial dry sump systems allowed.
c) Cooling system may be modified; glycol antifreeze shall not be
used. Radiators and oil
coolers shall not protrude above interior, outside body.
d) One 2 or 4 barrel carburetor may be used, and must be naturally
aspirated. No fuel
injection, electric fuel pumps, or magnetos. One (1) MSD box or
equivalent per car only.
e) Any American make engine may be used as long as rear of engine
(bell housing flange) is
mounted at least 72" forward from the centerline of rear axle.
Engine offset must be kept
within 2" of center-line of front cross member. Engine height
minimum will be 11"
from ground to front of center of crankshaft.
f) No adjusters of engine inside race car, or in reach of driver at
a) Cars must weigh no less than 2,400 lbs, 2450 lbs with aluminum
heads. NO TOLERANCE.
Maximum sixty percent (60%) left side
weight with driver in car,
setting in a normal racing position. When Hoosier tires are allowed, add 50 lbs and shift to maximum 58% left side weight (see tire rule).
Officials retain the right to weigh
any car before, during or
after race event. Spartan/SMS Speedway scales are deemed official and will
be used at all events.
b) Loose objects and/or weights must not be used in driver's
compartment or outside of
the body or hood area. Weights must be securely mounted and must be
painted white with car
number and attached with at least 1/2" bolts. No weight will be
permitted outside body or
frame, i.e. weight is not to be visible to spectators and be seen as a
contrast to body or
a) OEM production type transmission shall be allowed; 3 speed, 4
speed, automatic. No 5 speed
transmission or "in-out" boxes. All units must be clutch
operated with clutch inside
of bell housing (quick change transmissions optional). Bert, Brinn,
Falcon type transmissions
are optional. In the case of Bert, Brinn, Falcon type transmissions it
is understood that the
clutch is inside the transmission housing.
F. REAR AXLE AND DRIVE SHAFT:
b) Transmissions must have at least one gear forward and one gear
reverse, plus a neutral
position and be able to be shifted by driver.
c) Clutch type transmissions must be equipped with steel or aluminum
blow-proof bell housing.
Automatic transmissions must have an approved scatter shield or blanket.
May be constructed of
q/4" x 4" steel 270 degrees around flex plate or flywheel.
must remain in OEM stock appearing automatic case, with original bell
a) Any passenger car type or truck rear end may be used; no
aluminum allowed; except
lowering blocks; axle cap; and one piece drive flange only. Must be full
floating type with
double spline axles.
b) Conventional aluminum center section type quick changes, with
closed steel tubes, no
inboard brakes or cambered rear ends, one piece drive flange only, are
c) Drive shaft loop is required and shall be constructed of at
least 1/4" x 2"
steel material (or material of equivalent strength). Loop shall be
mounted no more than
6" back from front of drive shaft. Drive shaft shall be
constructed of steel &
painted white (no aluminum shafts allowed). No drive shafts smaller
than 2.5" diameter.
a) Brakes must operate on all four wheels and must lock-up during
inspection. No brake
shut-off devices allowed. No scalloped rotors, vented rotors only.
Calipers cannot be lightened
and must be OEM. Rotors cannot be lightened or drilled. Rotors may be
re-drilled for different
bolt patterns or larger studs.
b) Proportioning valve allowed, front to rear only.
a) All cars must have working mufflers passing 100 decibel noise test.
If in violation, repairs
must be made before car may return to the race track.
I. FUEL AND FUEL CELL:
b) Exhaust system must direct gasses away from cockpit and away from
possible fuel spillage
a) Racing fuel cells required and must be securely mounted; protected
by roll cage tubing,
have at least two solid straps 2" wide around cell. Fuel cells
must be square or
rectangle in shape and enclosed in metal containers, and located between
rear tires (cells may
not be mounted to the extreme left rear of cars). No part of fuel cell
should be lower than
protective tubing on both sides of fuel cell. Fuel cells must have
check valves, and pick-up
must come out top of cell. Fuel cells are limited to 22 gallons
maximum capacity. No tear drop,
wedge, or exotic F-1 type cells. Steel fuel cell can only! Minimum
thickness 22 Gauge
b) Fuel may be either gasoline or alcohol. No nitrous oxide.
a) Factory production complete full 1960 or newer parallel American
passenger car frames
only. Frames may be cut in rear only a point no further forward than
36" from center of
rear end housing. No 2002 and up Ford Crown Vic, Mercury Marque,
Maruader, or Lincoln Town Car
frames. Reproduction 68-72 Chevelle Frames are legal.
K. WHEELS AND TIRES:
b) Frames may not be widened or narrowed and must be able to
support roll cage on both
sides. Some "minor modification" to the left frame rail
(notching for seat clearance
& foot clearance), will be allowed, But major removal of material,
bending or folding of
material or relocation of these sections (OEM location only) will not be
allowed. Driver must
set inside OEM frame. Frame stiffener may be welded directly to outside
of left frame rail
only. Frame members must also remain uncovered so technical inspections
can be accomplished.
Front cross member may be notched for radiator clearance and/or steering
Minimum frame and body height from ground is 4" (exception is front
cross member) and is
c) Minimum wheelbase, 108" both sides. Maximum overall width
(front or rear) shall not
exceed 78" tread to tread. No tube type front clips allowed, and
no aluminum or
fiberglass suspension parts.
d) No Jeep, Bronco, etc. or 4-wheel drive frames allowed. No front
wheel drive allowed. No
sports car frames allowed.
e) Rear frame may be altered to accept leaf or coil springs; any
coil spring must be at
least 4.5" outside diameter. No fiberglass carbon fiber springs
allowed. No torsion bars
allowed in rear.
a) All wheels must be 8" steel racing wheels. No aluminum or
L. ROLL CAGES AND BUMPERS:
b)(Spartan & SMS)-revised 5/23/08: The American Racer 265/60X15 (704 compound) or Hoosier 970. The American Racer tire is available at both tracks.
c) No tire soaking or softening of any kind is allowed. Officials
reserve the right to durometer tires and test or inspect tires at any
time. This rule applies to all tires in the pits, on the car, in the
trailer or hauler, all tires!
a) Must consist of continuous hoops not less than 1.666" outside
diameter and must have a
wall thickness of at least .095.
M. STEERING AND SUSPENSION:
b) Must be frame mounted in at least six (6) places. Roll bar
padding required in driver
compartment (fire retardant roll bar padding highly recommended)
c) Must consist of configuration of front and rear hoops connected by
tubing on the sides or
side hoops. Driver's head shall not protrude above the roll cage
with helmet on and
strapped in seat. Roll cage shall be securely supported and braced, and
have a minimum of one
cross bar in top halo or roll cage.
d) Low carbon mild steel tubing in recommended. No brazing or
e) Protection of feet is mandatory, with bar across back of engine
with vertical bars and rub
rails or similar protection.
f) No brace bars forward of cage may be higher than stock hood
g) A minimum of 4 driver side door bars shall be as parallel with the
ground as possible and
located perpendicular to the driver so as to provide maximum protection
for driver, but without
causing undue difficulty in entering and exiting racecar. The side bars
must be welded to the
front and rear of the roll cage members. No brazing or soldering
allowed. Door plate 18"
x 24" inside driver's side door is mandatory. Must be at
least .095-.125 thickness.
Door bars may be filled in to equal 18" x 24". Door plate must
be visible for
h) Bumpers shall be used both front and rear. Front bumper shall be
mounted frame-end to
frame-end with bottom loop parallel to ground. Bumpers should be made
of minimum 1.25"
tubing and shall be able to support car if lifted by a wrecker. The
front edge of the front
bumper shall not be located more than 2.5" to the rear of the front
face of the lower
hoop. The front bumper and nose shall not extend forward of a line 42"
from center of tire and a maximum width of 38".
i) Rear bumpers, nerf bars and bodies shall not extend beyond width
of rear tires, and must
not contain any sharp edges. Left rear tire must be visible from front,
top, and rear.
j) Rear bumpers may be constructed of tubing or flat stock and must
protect fuel cell.
Center of bumper (front & rear) must be 18" +/- 2" from
ground. Rear bumpers not
more than 2" wider than body on each side. Aluminum "I"
beam type bumpers are
legal on rear only, and must have no sharp edges. Rear quarter panels
shall not extend farther
back than 45" center of rear axle to quarter and maintain a minimum
of 8" ground
a) No rack and pinion steering allowed. Steering box must be OEM and
remain within original
bolt pattern for type of frame used. Cockpit steering may be modified to
suit driver, but must
remain located on left side.
b) Aluminum hubs, calipers, "A" frames or spindles, or
any other aluminum
suspension parts are not allowed. Aluminum pan hard bar adjusters are
c) Front suspension and steering must be steel, unaltered, approved
OEM, and be in stock
location. Drag link may be OEM, or OEM after-market type. Parts must be
replaceable by stock
part from same type suspension. Heim joints and steel tube sleeves
allowed. Stock passenger
car spindles only, no fabricated spindles, No made for racing spindles.
Bottom A-frame cannot
be altered or moved. Front sway bar must be OEM, or OEM type. No
offset Lower A-Bushings,
aluminum knuckles, or steering shaft.
d) No hydraulic, ratchet, or electric weight jacks any where in or
e) One steel shock per wheel only. Must be steel body, and with no
f) If tubular lower A-arms are used, they must
meet original dimensions
exactly. If using stock lower A-arms, mono-ball bushings may be used to
replace original rubber
g) Tube type upper A-frame allowed and can be moved. Cross shaft
may be aluminum. All ball
joints OEM Type.
h) Any coil spring must be at least 4.5" outside diameter. No
fiberglass carbon fiber
springs allowed. No torsion bars allowed in rear.
i) 5" steel or aluminum coil-over shock kits allowed on rear
only. Must use 5"
j) No adjusters of chassis inside race car, or in reach of driver at
a) The driver shall accompany racecar at time of technical inspection
and be equipped with all
personal safety equipment. He/she must be fully capable of safely
operating racecar for the
duration of all events.
b) Fire suppression systems are mandatory. Minimum 5 lb fire
extinquisher. Fire extinguisher
gauge must be visible upon inspection.
c) Racecars that use alcohol fuel will be marked on each side with
the capital letter
"A" in a conspicuous place and of a size sufficient to readily
identify its usage.
d) Snell SA95 or SA2000 helmets are required and must be worn by all
retardant gloves are mandatory. Fire retardant shoes and underwear are
Head, shoulder and leg containment devices are highly recommended. It is
mandatory that all
drivers use an unaltered safety neck brace (horse collar); a head/neck
restraint system is
e) SFI approved full fire suits of a flame retarding nature shall be
worn by all competitors.
f) Five (5) point safety harness system is required. Metal to metal
buckles are required on
shoulder and seat belts. The shoulder and seat belts shall be mounted
securely. Seat belts
and shoulder harness shall be inspected before use, and must be clearly
dated no older than 3
g) A full size window net on driver side is required (minimum 16 x
20). No string-type nets
allowed. Window net hardware to be mounted so latch is at the top of
h) Kill switch required within easy reach of driver. This switch
shall be clearly marked
"ON" & "Off" with a minimum of 3/8 high letters.
i) Roll bar padding is required in the driver compartment.
j) All other required safety equipment and specifications are
addressed in Section 4 of this rule